Diagnostic line-ratio diagrams based on [O III] λ 4364 emission. In all three panels the dashed line is the empirical demarcation between pure AGN and AGN/SF mixtures proposed by Mazzolari et al. (2024). The faded markers with error bars are determined from our pPXF fits to the spectra without reddening correction. The bold markers show the values after reddening correction, with A_V = 1.58 ± 0.16 mag for O3-N-core and A_V = 0 mag for O3-S-HeII. The black arrows denote the dereddening vector for an attenuation of A_V = 1 mag with the Calzetti et al. (2000) attenuation law.